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ORIGINAL RESEARCH article

Front. Oncol., 14 April 2023
Sec. Gastrointestinal Cancers: Hepato Pancreatic Biliary Cancers

The pre- and postoperative nomograms to predict the textbook outcomes of patients who underwent hepatectomy for hepatocellular carcinoma

Gui-Lin Xie&#x;Gui-Lin Xie1†Lei Liang&#x;Lei Liang2†Tai-Wei Ye,&#x;Tai-Wei Ye2,3†Fei-Qi Xu,&#x;Fei-Qi Xu2,3†Dong-Dong WangDong-Dong Wang2Ya-Ming XieYa-Ming Xie2Kang-Jun Zhang,Kang-Jun Zhang2,3Tian-Wei Fu,Tian-Wei Fu2,3Wei-Feng YaoWei-Feng Yao2Jun-Wei Liu*Jun-Wei Liu2*Cheng-Wu Zhang*Cheng-Wu Zhang2*
  • 1Department of Hepatobiliary Surgery, Affiliated Hospital of Shaoxing University, Shaoxing, Zhejiang, China
  • 2General Surgery, Cancer Center, Department of Hepatobiliary and Pancreatic Surgery and Minimally Invasive Surgery, Zhejiang Provincial People’s Hospital, Affiliated People’s Hospital, Hangzhou Medical College, Hangzhou, Zhejiang, China
  • 3The Second School of Clinical Medicine, Zhejiang Chinese Medical University, Hangzhou, China

Background and aims: An increasing number of studies have confirmed that non-textbook outcomes (non-TO) are a risk factor for the long-term outcome of malignant tumors. It is particularly important to identify the predictive factors of non-TO to improve the quality of surgical treatment. We attempted to construct two nomograms for preoperative and postoperative prediction of non-TO after laparoscopic hepatectomy for hepatocellular carcinoma (HCC).

Methods: Patients who underwent curative-intent hepatectomy for HCC between 2014 and 2021 at two Chinese hospitals were analyzed. Using univariate and multivariate analyses, the independent predictors of non-TO were identified. The prediction accuracy is accurately measured by the receiver operating characteristic (ROC) curve and calibration curve. ROC curves for the preoperative and postoperative models, Child–Pugh grade, BCLC staging, and 8th TNM staging were compared relative to predictive accuracy for non-TO.

Results: Among 515 patients, 286 patients (55.5%) did not achieve TO in the entire cohort. Seven and eight independent risk factors were included in the preoperative and postoperative predictive models by multivariate logistic regression analysis, respectively. The areas under the ROC curves for the postoperative and preoperative models, Child–Pugh grade, BCLC staging, and 8th TNM staging in predicting non-TO were 0.762, 0.698, 0.579, 0.569, and 0.567, respectively.

Conclusion: Our proposed preoperative and postoperative nomogram models were able to identify patients at high risk of non-TO following laparoscopic resection of HCC, which may guide clinicians to make individualized surgical decisions, improve postoperative survival, and plan adjuvant therapy against recurrence.

Introduction

Primary liver cancer is the seventh most common cancer disease and is the second leading cause of cancer-related death (1). Hepatocellular carcinoma (HCC) is still the most common form of primary liver cancer, accounting for 90% of medical records (2). Clinically adopted curative treatment methods for HCC include open or minimally invasive liver resection, radiofrequency ablation, and liver transplantation. Transcatheter arterial chemoembolization (TACE) and targeted therapy and immunotherapy are used as adjuvant or neoadjuvant therapy for HCC patients. While multimodal treatment is well known to gain a significant impact on the prognosis of patients with HCC, the outcomes are still far from satisfactory. Thus, it is critical to investigate which clinical factors are associated with improved overall survival (OS) in patients with HCC.

Previous studies had shown that intraoperative blood transfusion (35) as well as postoperative complications (6, 7) representing the perioperative medical quality have a far-reaching influence on the OS for HCC patients. Nevertheless, for patients with HCC who need surgical treatment, it is not enough to use a single variable to assess the impacts on different individuals. “Textbook outcomes”, as a comprehensive indicator, have been reported extensively, evaluating surgical quality and safety. Many studies have previously demonstrated patients with malignancies, such as esophageal cancer (811), colon cancer (12), lung cancer (13), primary liver cancer (14, 15), and soft tissue sarcoma (16), who achieved TO, representing the ideal clinical procedure, which could improve long-term outcomes.

Compared with open liver resection, laparoscopic liver resection (LLR) tends to reach TO, which reflects the advantages of minimally invasive surgery (17).

LLR of anterolateral segments of liver was considered as a standard operation and the relationship between LLR of anterolateral hepatic segments with TO had been explored in a previous study (15). However, with the increasing maturity of LLR technology, the use of minimally invasive surgical approach in other segments has also been widely performed. Therefore, it is crucial to comprehensively analyze which factors affect the TO of LLR. The aim of the present study is to identify the predictors of non-TO, and implement corresponding preoperative intervention for patients who would undergo LLR. In addition, using a multicenter database, preoperative and postoperative nomogram models were conducted to predict non-TO.

Patients and methods

Patients and study design

Consecutive patients with HCC who received curative-intention LLR in Zhejiang Provincial People’s Hospital and Shaoxing Municipal Hospital from 2016 to December 2021 were enrolled. Exclusion criteria include the following: (1) repeat liver resection for recurrent HCC, (2) under 18 years of age, (3) traditional open hepatectomy, and (4) important dates or data missing related to TO. HCC patients were initially differentiated according to dynamic CT or MRI. If the imaging diagnostic characteristics in CT or MR are special for HCC (strong contrast medium intake in arterial phase, and extracellular contrast medium flushing out in venous phase and/or delayed phase), then all HCC will be diagnosed by pathology of patient samples. This retrospective study was in line with the Helsinki Declaration and was approved by the Institutional Ethics Committee, and the need for informed consent was abandoned.

Clinicopathological variables

The preoperative, intraoperative, and postoperative clinical variables were prospectively and retrospectively collected from the medical record system of Zhejiang Provincial People’s Hospital and Shaoxing Municipal Hospital. Preoperative variables included age at surgery; sex; body mass index (BMI); American Society of Anesthesiologists (ASA) score; history of alcohol drinking, diabetes mellitus, and cigarette smoking; hepatitis B virus (HBV); presence of cirrhosis and portal hypertension; Child–Pugh grade; preoperative levels of alpha-fetoprotein (AFP); albumin–bilirubin (ALBI) score; neutrophil-to-lymphocyte ratio (NLR) score; alanine aminotransferase (ALT); aspartate transaminase (AST); preoperative platelet count; maximum diameter of tumor; tumor location; tumor number; and macrovascular invasion through preoperative imaging. Intraoperative variables included intraoperative blood loss, type of resection, and extent of hepatectomy. In this study, obesity was defined as BMI ≥ 28 kg/m2. According to the ALBI score classification: ALBI score ≤ −2.6 (grade I), −2.6 < ALBI score ≤ −1.39 (grade II), and ALBI score > −1.39 (grade III). High ALBI grade was defined as having ALBI grade II/III, and normal ALBI grade was defined as having an ALBI score ≤ −2.6 (grade I) (18). The NLR score divided patients into two groups: score ≤ 2.81 (low grade) and score > 2.81 (high grade) (19). Tumor number ≥ 2 was defined as multiple tumors. The extent of hepatectomy was divided into major or minor liver resection. Hepatectomy was classified as anatomical and non-anatomical based on Brisbane 2000 criteria (20). All the serum samples were collected in the morning when the patient had not eaten for more than 8 h. The information was obtained before all the treatments and less than 1 week before the operation. All independent variables of serological tests were tested by clinical laboratories of two hospitals.

Textbook outcome

In the present study, TO consists of six parameters, namely, (1) without 30-day morbidity after surgery; (2) no prolonged duration of hospital stays; (3) no perioperative blood transfusion; (4) no readmission within 30 days after discharge (21); (5) without 90-day mortality after surgery; and (6) R0 resection. Postoperative morbidities include liver failure, bile leakage or other biliary complications, hemorrhage, infection from a variety of causes, and cardiovascular, brain, pulmonary, renal, and other complications. According to the criterion for the prolonged length of hospital stay after surgery (17), we defined 10 days as the cutoff value. The negative result of both microscopic and macroscopic observations of resection margin was defined as R0 resection (22). If the above six conditions were met, TO of LLR was considered achieved; otherwise, it is non-TO.

Definition of Child–Pugh grade, BCLC staging, and 8th TNM staging

The Child–Pugh grade was defined as follows: grade A (5–6 points), grade B (7–9 points), and grade C (10–15 points). In this study, there were no patients with Child–Pugh grade C. BCLC staging was classified as very early stage (BCLC 0), early stage (BCLC-A), intermediate stage (BCLC-B), advanced stage (BCLC-C), and end-stage (BCLC-D) based on tumor burden, liver function, and performance status. We defined BCLC 0/A as early stage and there were no patients with BCLC-D in our study. The 8th TNM staging system is mainly based on factors associated with tumor size and number, vascular invasion, invasion of visceral peritoneum, and lymph node or distant metastasis.

Statistical analysis

The statistical analysis was carried out using the SPSS 25.0 (SPSS, Inc) and R 4.2.1 (http://www.r-project.org/). The categorical variables are indicated by number (n) and percentage (%). Comparison of categorical variables shall be adopted as appropriate χ2 test or Fisher exact test. Univariate and multivariate logistic regression analysis was performed to determine independent preoperative predictors of non-TO. In univariate analysis, the variables with p < 0.1 were entered into the multivariate regression model using the forward stepwise variable selection method. Two nomograms were built up on the basis of the results of the multivariate analysis of the preoperative data. The nomogram was subjected to 1,000 bootstrap resamples for internal validation of each cohort. The model performance for predicting outcome was evaluated by calculating the area under the receiver operating characteristic curve (AUC) (23). Evaluate the calibration of the nomogram according to the calibration curve. The results predicted by the accurate measurement model of the calibration curve are related to the conclusions seen in the queue. p < 0.05 was considered statistically significant.

Results

Comparisons of TO and non-TO

Among 515 patients who underwent curative-intent LLR for HCC enrolled in the study, a total of 286 (55.5%) patients did not achieve TO, and 229 (44.5%) patients achieved TO. There was 1 (0.19%) patient who died within 90 days after surgery, 6 (1.17%) patients were readmitted within 30 days after discharge, 7 (1.36%) patients were subjected to R1 or R2 resection, 100 (19.42%) patients underwent perioperative blood transfusion, 113 (21.94%) patients had prolonged postoperative length of hospital stay, and 197 (38.25%) patients encountered postoperative 30-day morbidity (Figure 1).

FIGURE 1
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Figure 1 Distribution of outcome measures between the two groups.

Baseline characteristics

There are 515 people in all queues (Table 1), which shows the comparison of the characteristics of the baseline between the TO group and the non-TO group. Compared with TO group patients, non-TO patients had a higher proportion of age > 70 years, obesity, portal hypertension, high ALBI grade, high NLR grade, AST level (>40 U/L), location of tumor (7/8 segment), largest tumor size (>5 cm), multiple tumors, macroscopic vascular invasion, intraoperative blood loss (>400 ml), and major hepatectomy (all p < 0.05).

TABLE 1
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Table 1 Comparisons of clinical characteristics among the two groups according to textbook outcomes.

Independent risk factors associated with non-TO

Univariate and multivariate logistic regression analysis of preoperative and postoperative variables confirmed several independent risk factors related to non-TO (Table 2). Variables with p < 0.1 were included in the multivariable logistic regression model. In the preoperative model, multiple regression analysis data showed that obesity, portal hypertension, high ALBI classification, high NLR classification, tumor in segment 7/8, maximum tumor size > 5 cm, and multiple tumors were identified as independent risk factors of non-TO. In addition, in the postoperative predictive model, age > 70 years, obesity, portal hypertension, high ALBI grade, high NLR grade, tumor in segment 7/8, intraoperative blood loss > 400 ml, and major hepatectomy were independent risk factors associated with a higher incidence of non-TO.

TABLE 2
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Table 2 Univariable and multivariable logistic regression analyses of risk factors associated with not achieving a textbook outcome following hepatectomy for HCC.

Preoperative and postoperative nomogram models for predicting non-TO

Based on the results of multivariate logistic regression model, two nomogram models were established to predict non-TO before and after surgery. The preoperative predictive nomogram model included only preoperative variables, while the postoperative predictive nomogram model included preoperative and intraoperative variables. As shown in Figure 2, each predictor has a specific score on the corresponding point line. By adding each risk factor score to get a total score, a vertical line can be drawn down from that particular point to obtain the probability of non-TO. The receiver operating characteristic curves of the two models are demonstrated in Figures 3A, C (AUC = 0.698; 95% CI: 0.654–0.743 vs. AUC = 0.722; 95% CI: 0.722–0.803). Meanwhile, Figures 3B, D show that the calibration plots of preoperative and postoperative nomograms had acceptable fit and consistency between the predictive value and actual observation.

FIGURE 2
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Figure 2 The preoperative (A) and postoperative (B) nomogram models for predicting non-TO.

FIGURE 3
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Figure 3 Receiver operating characteristic curves [(A), preoperative model; (C), postoperative model] and calibration charts [(B), preoperative model; (D), postoperative model] for predicting preoperative and postoperative non-TO models. The calibration chart compares preoperative and postoperative results with actual results. The dotted line is the reference line, indicating the position of the ideal nomogram. The solid line represents the bootstrap performance of 40 samples of the nomogram. When the predicted probability is plotted against the actual probability, the calibration plot is close to the dotted line, indicating that the calibration plot for the nomogram is good in both groups. AUC, area under the curve; CI, confidence interval.

Predictive accuracy of two nomogram models for non-TO

Using the ROC curves, the predictive power of index was evaluated. The comparisons of the discriminatory ability of the two predictive models, Child–Pugh grade, 8th TNM staging, and BCLC staging for predicting the non-TO are shown in Figure 4. The AUCs of the preoperative and postoperative nomogram models were (0.698; 0.654–0.743) and (0.762; 0.722–0.803), respectively, which were superior to those of Child–Pugh grade (0.579; 0.542–0.617), BCLC staging (0.569; 0.525–0.612), and 8th TNM staging (0.567; 0.523–0.610).

FIGURE 4
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Figure 4 Receiver operating characteristic curves of preoperative and postoperative predictive models, and Child–Pugh grade, tumor-node-metastasis (8th TNM) staging, and Barcelona Clinic Liver Cancer (BCLC) staging for predicting non-textbook outcomes (non-TO).

Discussion

TO can be used not only as a comprehensive index of the quality of surgical treatment, but also as an unalterable predictor of long-term recovery of many malignant tumors. Therefore, since some kinds of influencing factors are likely to be improved or reduced, it is particularly important to clarify the correlation between clinical medical variables and non-TO after tumor surgery. The present study develops preoperative and postoperative nomograms. To our knowledge, this is the first study to predict non-TO after LLR for HCC.

Among 515 patients who underwent LLR for HCC, 229 patients (44.5%) achieved TO in the whole cohort, which was better than previous studies (33.3%–34.4%) (24, 25). The predictors we mainly analyzed include the general condition of the patients, liver function, immune inflammation of the body, tumor burden, tumor location, and surgical procedure. The preoperative prediction model integrates portal hypertension, high ALBI grade, high NLR grade, tumor site, maximum tumor size > 5 cm, and multiple tumors. The discriminatory ability of the preoperative nomogram nearly reached 0.7. Previous studies had found that preoperative low and high BMI were associated with lower chances of achieving TO (25). Similarly, obesity, BMI > 28 kg/m2, also had a negative impact on TO in the present study. High ALBI and portal hypertension, indicators of poor liver function, were proved in previous studies (14, 17, 25). Insufficient liver reserve is closely related to postoperative complications, including liver failure and massive ascites. As an easily calculated and inexpensive marker, preoperative NLR tended to reflect the system inflammation of the human body and long-term prognosis of several malignancies. Owing to chronic infection with HBV or hepatitis C virus (HCV), patients with HCC and high NLR grade have neutrophilic leukocytosis and lymphocytopenia, which demonstrated that the balance is tilted towards tumor inflammatory response, leading to a disappointing surgical outcome. Previous studies have shown that NLR is independently associated with postoperative complications and in-hospital mortality (26, 27). In our present study, similarly, we also confirmed that NLR is an independent risk factor for TO, suggesting the potential usefulness of deducing elevated NLR before LLR.

Different from traditional open hepatectomy, LLR has the characteristic of magnifying the surgical field, while a limited operating space and the lack of actual touch mean higher surgical difficulty and a longer learning curve for hepatobiliary surgeons. Tumor location as well as tumor burden including tumor size and number would directly affect the complexity of LLR. In the study, tumor size > 5 cm, multiple tumors, and segment 7/8 were predictors for TO by using logistic regression analysis. For lesions located at segment 7/8, the occurrence of postoperative complications was significantly higher than other segments, because of the great difficulty level of tumor location (28). The feasibility and safety of LLR for tumor size ≤ 5 cm were widely recognized by surgeons (29). With the progress and development of minimally invasive surgery, large (>5 cm) and even giant (>10 cm) malignant liver tumors are not a contraindication for LLR (3032). In our study, however, a tumor size greater than 5 cm made it more difficult to achieve TO. In the postoperative nomogram, we can find that major hepatectomy, instead of tumor size and number, was a risk factor for TO. It is believed that the greater the tumor burden, the greater the extent of liver resection. After multivariate logistic regression adjustment, the authentic postoperative independent predictor depends on major hepatectomy rather than tumor burden for patients with HCC who were subjected to LLR. In addition, the treatment for large and giant HCC using LLR is difficult and requires the operator’s proficient minimally invasive technique. Whether traditional open liver resection is more conducive to achieving TO deserves further study.

The main limitation of the paper mainly arises from its retrospective nature, rendering it susceptible to selection bias. Second, this study included patients with HCC who received laparoscopic hepatectomy. Therefore, further assessment is required to implement whether HCC patients treated with open hepatectomy could be used as reference. Third, the patients in this study also received treatment in China, and most HCC patients have a background of HBV infection. However, in Europe and the United States, HCV infection and excessive drinking are the risk factors (33, 34). The predictive models need an external validation cohort to improve the model reliability. In addition, prospective studies are needed to further confirm the reliability of nomograms. Fourth, this study focused on primary HCC, and recurrent HCC needs further research in the future.

In conclusion, the present study systematically revealed the factors influencing the non-TO of LLR for HCC patients. In addition, two nomograms were conducted for predicting non-TO, which were superior to the Child–Pugh grade, TNM staging, and BCLC staging and could help surgeons make individualized treatment plans for HCC patients to achieve TO.

Data availability statement

The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

Author contributions

G-LX, LL, T-WY, and F-QX contributed equally to this work. C-WZ and J-WL had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: G-LX, C-WZ, and J-WL. Acquisition, analysis, or interpretation of data: LL, T-WY, F-QX, D-DW, Y-MX, K-JZ, T-WF, and W-FY. Drafting of the manuscript: G-LX and LL. Critical revision of the manuscript for important intellectual content: W-FY, J-WL, and C-WZ. Statistical analysis: LL, T-WY, and F-QX. Obtained funding: C-WZ, D-DW, and Y-MX. Administrative, technical, or material support: C-WZ, J-WL, and W-FY. Study supervision: C-WZ and J-WL. All authors contributed to the article and approved the submitted version.

Funding

Funding for the study was provided by the Health Commission of Zhejiang Province (No. 2018KY261) and the General Scientific Research Project of the Education Department of Zhejiang Province (No. Y201840617). The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Abbreviations

HCC, hepatocellular carcinoma; TACE, transcatheter arterial chemoembolization; OS, overall survival; TO, textbook outcomes; LLR, laparoscopic liver resection; BMI, body mass index; ASA, American Society of Anesthesiologists; HBV, hepatitis B virus; ALBI, albumin–bilirubin grade; AFP, alpha fetoprotein; NLR, neutrophil-to-lymphocyte ratio; ALT, alanine aminotransferase; AST, aspartate aminotransferase; PLT, platelets; MV, multivariable; NA, not available; OR, odds ratio; UV, univariable; CI, confidence interval.

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Keywords: hepatocellular carcinoma, textbook outcomes, nomogram, hepatectomy, laparoscopic

Citation: Xie G-L, Liang L, Ye T-W, Xu F-Q, Wang D-D, Xie Y-M, Zhang K-J, Fu T-W, Yao W-F, Liu J-W and Zhang C-W (2023) The pre- and postoperative nomograms to predict the textbook outcomes of patients who underwent hepatectomy for hepatocellular carcinoma. Front. Oncol. 13:1089716. doi: 10.3389/fonc.2023.1089716

Received: 04 November 2022; Accepted: 30 March 2023;
Published: 14 April 2023.

Edited by:

Ravindra Deshpande, Wake Forest University, United States

Reviewed by:

Feng Lyu, Henan Provincial People’s Hospital, China
Duilio Pagano, Mediterranean Institute for Transplantation and Highly Specialized Therapies (ISMETT), Italy

Copyright © 2023 Xie, Liang, Ye, Xu, Wang, Xie, Zhang, Fu, Yao, Liu and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Cheng-Wu Zhang, emN3enJ5QDE2My5jb20=; Jun-Wei Liu, bGl1anVud2VpQGhtYy5lZHUuY24=

These authors have contributed equally to this work

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.